docs: def path_regex(self):
          """Return the regex for the path to the build folder."""
          build_dir = 'try-%(PLATFORM)s%(DEBUG)s/' % {
              'PLATFORM': self.platform_regex,
              'DEBUG': '-debug' if self.debug_build else ''}
          return urljoin(self.build_list_regex,
                         self.builds[self.build_index],
                         build_dir)